JP2011188463A - Utterance detection apparatus and voice communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an utterance detection apparatus which can be used for detecting the intention of a speaking person, and a voice communication system employing the utterance detection apparatus. <P>SOLUTION: A voice communication system 100 includes a pair of utterance detection apparatuses 10, 20. The utterance detection apparatus 10 includes an acceleration sensor 11, capable of detecting the motion displacement amount of a lower jaw part of the speaking person; a radio transmitter 12 connected to the acceleration sensor 11; a radio receiver 13; a signal generator 14 connected to the radio receiver 13; and a vibrator (voice vibration generating part) 15 connected to the signal generator 14. Furthermore, the utterance detection apparatus 20 includes an acceleration sensor 21; a radio transmitter 22 connected to the acceleration sensor 21; a radio receiver 23; a signal generator 24 connected to the radio receiver 23; and a vibrator 25 connected to the signal generator 24. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an utterance detection device that detects an utterance of a speaker, and an audio communication system including the utterance detection device.

  Conventionally, there is an oral movement measuring apparatus as shown in Patent Document 1 below. The oral movement measuring device measures a subject's oral movement based on a triaxial acceleration sensor that can be attached to a selected part of the subject's masseter, genital region, and larynx, and the output of the triaxial acceleration sensor. And a measuring unit.

JP 2008-18094 A

  However, the apparatus disclosed in Patent Document 1 merely measures oral movement, and cannot be used to detect the intention of a speaker.

  Accordingly, an object of the present invention is to provide an utterance detection device that can be used to detect the intention of a speaker, and an audio communication system using the utterance detection device.

(1) An utterance detection device according to one aspect includes an attachment member that can be attached to a lower jaw part of a speaker, and an acceleration sensor that is fixed to the attachment member and can detect an operation displacement amount of the lower jaw part. It is what.

  If the utterance detection device having the above configuration (1) is attached to the lower jaw of the speaker, it is possible to detect the amount of motion displacement of the lower jaw that is operated when the speaker speaks. If a voice corresponding to the detected motion displacement amount is prepared in advance and the detected motion displacement amount can be converted into the voice, for example, a person who is in a state where the speaker cannot speak. Even if the speaker is a person who is in an environment where it is difficult for voice to be transmitted in outer space or underwater, the intention of the speaker can be detected. Therefore, the utterance detection device having the configuration (1) can be used to detect the intention of the speaker. In addition, the lower jaw part here includes both the inside and outside of the oral cavity.

(2) In the utterance detection device according to (1), the mounting member is a long plate-like member having flexibility, and the acceleration sensor is attached to one surface of the long plate-like member. It is preferable.

  The utterance detection device having the configuration (2) can be attached to the other side of the long plate-like member along the teeth inside the speaker using, for example, a denture base stabilizing paste. It is. Therefore, it is possible to efficiently detect the amount of motion displacement of the lower jaw of the speaker. Thereby, the utterance detection device having the configuration (2) can be used to accurately detect the intention of the speaker.

(3) In the utterance detection device according to (1) or (2), the attachment member is attached around the mouth or in the oral cavity, and the acceleration sensor is excited by the generation of the speaker. It may be one that detects vibration.

  With configuration (3) above, it is possible to detect air vibrations excited by the generation of a speaker. In addition, if the detected air vibration information is used for the voice conversion together with the movement displacement information of the lower jaw of the speaker, the intention of the speaker can be detected with higher accuracy.

(4) In the utterance detection devices according to the above (1) to (3), the acceleration sensor may detect a body vibration excited by the generation of the speaker.

  With configuration (4) above, it is possible to detect body vibrations excited by the generation of a speaker. If the detected body vibration information is also used for the voice conversion, the intention of the speaker can be detected with higher accuracy.

(5) A voice communication system according to another aspect has two or more utterance detection devices of any one of the above (1) to (4). Each of the utterance detection devices includes a transmission / reception unit that transmits / receives information detected by each acceleration sensor to / from each other, and a voice generation unit that converts information received by the transmission / reception unit into speech and emits it. is there.

  According to the configuration of (5) above, even if the speaker cannot speak, or the speaker is in an environment where it is difficult to transmit the sound in outer space or underwater. However, they can easily communicate with each other.

(6) A voice communication system according to another aspect includes two or more utterance detection devices of any one of the above (1) to (4). Each of the speech detection devices includes a transmission / reception unit that transmits / receives information detected by each acceleration sensor to / from each other, and a voice vibration generation unit that converts information received by the transmission / reception unit into voice vibration and emits the information. Is.

  According to the configuration of (6) above, mutual voice communication can be performed. In particular, since a voice vibration conversion unit that converts information received by the transmission / reception unit into voice vibration is provided, the voice vibration conversion unit is attached within a range where the voice vibration reaches the ear of the body of the speaker, and the voice If the vibration can be conducted directly to the ear, mutual voice communication is possible even in an environment where the utterance of the speaker is difficult to be transmitted, such as in space or underwater.

1 is a schematic configuration diagram showing an audio communication system according to an embodiment of the present invention. It is a schematic block diagram which shows the experimental apparatus containing the speech detection apparatus used in the Example of this invention. It is a schematic diagram which shows the state which attached the speech detection apparatus shown in FIG. 2 to the front center of the lower incisor's middle incisor. It is the graph which showed the result of the experiment 1 in the Example of this invention, Comprising: It is the graph which showed the time change of the acceleration in the mandibular central incisor front part at the time of the utterance about the x-axis direction. It is the graph which showed the result of the experiment 1 in the Example of this invention, Comprising: It is the graph which showed the time change of the acceleration in the mandibular central incisor front part at the time of the utterance about the y-axis direction. It is the graph which showed the result of the experiment 1 in the Example of this invention, Comprising: It is the graph which showed the time change of the acceleration in the mandibular central incisor front part at the time of the utterance about z-axis direction. It is the graph which expanded and compounded the predetermined part of FIGS. It is a graph which shows the power spectrum of the x-axis direction of the acceleration of the mandibular central incisor at the time of speech in Experiment 1 of the Example of this invention. It is a graph which shows the power spectrum of the y-axis direction of the acceleration of the mandibular central incisor at the time of speech in Experiment 1 of the Example of this invention. It is a graph which shows the power spectrum of the z-axis direction of the acceleration of the mandibular central incisor at the time of speech in Experiment 1 of the Example of this invention. It is the graph which expanded and showed the one part frequency band of the graph of FIG. It is the graph which expanded and showed the one part frequency band of the graph of FIG. It is the graph which expanded and showed the one part frequency band of the graph of FIG. It is the graph which showed the change of the acceleration of the mandibular central incisor front part by the lip | synchronizing in the experiment 2 of the Example of this invention. It is the graph which showed the change of the acceleration of the mandibular central incisor front part by humming in Experiment 2 of the Example of this invention. It is the graph which showed the power spectrum of the acceleration of the mandibular central incisor front part by the lip | synchronizing in the experiment 2 of the Example of this invention. It is the graph which showed the power spectrum of the acceleration of the mandibular central incisor front part by the humming in Experiment 2 of the Example of this invention.

  Hereinafter, an utterance detection apparatus according to an embodiment of the present invention will be described with reference to FIG.

  The voice communication system 100 includes a pair of utterance detection devices 10 and 20 capable of detecting the utterance of a speaker. Each of the utterance detection devices 10 and 20 can be used by being attached to each body of two utterers, and can perform mutual voice communication.

  The speech detection apparatus 10 includes an acceleration sensor 11, a wireless transmitter 12 connected to the acceleration sensor 11, a wireless receiver 13, a signal generator 14 connected to the wireless receiver 13, and a signal generator 14. And a vibrator (sound vibration generator) 15 connected to the. Further, the speech detection device 20 includes an acceleration sensor 21, a wireless transmitter 22 connected to the acceleration sensor 21, a wireless receiver 23, a signal generator 24 connected to the wireless receiver 23, and a signal generator. And a vibrator 25 connected to the vessel 24.

  Each of the acceleration sensors 11 and 21 is composed of a unimorph obtained by processing a piezoelectric element into a single plate shape. The material of this piezoelectric element may be quartz or lead zirconate titanate (PZT). Further, each of the acceleration sensors 11 and 21 may be constituted by a bimorph that uses two unimorphs bonded together via a metal plate. Each of the acceleration sensors 11 and 21 may be a three-axis acceleration sensor that can measure acceleration in the x-axis, y-axis, and z-axis directions. In addition, each of the acceleration sensors 11 and 21 is provided with an attachment member (for example, flexible plastic, or the like) at any position on the lower jaw of the speaker so that the movement displacement of the lower jaw of the speaker can be detected. , A metal formed in a predetermined shape, etc.). With such a configuration, each of the acceleration sensors 11 and 21 detects the amount of movement of the lower jaw of the speaker as an acceleration by the piezoelectric effect, converts this into an electrical signal as a voice signal, and each of the wireless transmitters 12 and 22 Can be output to. Here, as a modified example, each of the acceleration sensors 11 and 21 is a piezoresistive sensor that detects the distortion of the beam generated when the acceleration acts on the weight using the piezoresistance effect, or the acceleration sensor It may be of a capacitance type that detects displacement when acting on the weight by a change in capacitance using a comb electrode or the like.

  The wireless transmitter 12 transmits the electrical signal output from the acceleration sensor 11 to the wireless receiver 23. The wireless transmitter 22 transmits the electrical signal output from the acceleration sensor 21 to the wireless receiver 13.

  The wireless receiver 13 can receive the electrical signal transmitted from the wireless transmitter 22 and outputs the electrical signal to the signal generator 14. The wireless receiver 23 is capable of receiving an electrical signal transmitted from the wireless transmitter 12 and outputs the electrical signal to the signal generator 24.

  The signal generator 14 converts the electrical signal output from the wireless receiver 13 into a vibration signal for vibrating the vibrator 15, and outputs the vibration signal to the vibrator 15. The signal generator 24 converts the electrical signal output from the wireless receiver 23 into a vibration signal for vibrating the vibrator 25, and outputs the vibration signal to the vibrator 25.

  The vibrator 15 vibrates by the vibration signal output from the signal generator 14 and can transmit sound to the ear by bone conduction or the like. The vibrator 25 vibrates by the vibration signal output from the signal generator 24 and transmits sound to the ear by bone conduction or the like. Each of the vibrators 15 and 25 includes a drive unit (not shown) made of a magnet having a magnetic circuit and a vibration unit (not shown) made of a coil and vibrated by the drive unit. is there.

  Next, the operation of the voice communication system 100 will be described. First, the utterance detection device 10 is attached to a predetermined portion of the lower jaw of one speaker so that the amount of motion displacement of the lower jaw when one speaker speaks can be detected. Similarly, the utterance detection device 20 is attached to a predetermined position on the lower jaw of the other speaker so that the amount of motion displacement of the lower jaw when the other speaker speaks can be detected. Then, the movement displacement amount of the lower jaw that is operated by one speaker speaking is detected as acceleration by the acceleration sensor 11, converted into an electrical signal as a voice signal, and output to the wireless transmitter 12. Next, the radio transmitter 12 to which the audio signal is input transmits the audio signal to the radio receiver 23 of the other speaker to which the utterance detection device 20 is attached. Subsequently, the wireless receiver 23 that has received the audio signal outputs the received audio signal to the signal generator 24. Subsequently, the signal generator 24 converts the electrical signal output from the wireless receiver 23 into a vibration signal for vibrating the vibrator 25, and outputs the vibration signal to the vibrator 25. As a result, the vibrator 25 vibrates and reaches the other speaker's ear through the face or bone of the person, so that the other speaker is away from the voice of one speaker or the transmission of the voice. It is possible to listen in difficult places.

  Similarly, when the other speaker speaks, the following occurs. That is, the amount of movement displacement of the lower jaw that is operated by the other speaker speaking is detected as an acceleration by the acceleration sensor 21, converted into an electrical signal as a voice signal, and output to the wireless transmitter 22. Next, the radio transmitter 22 to which the audio signal is input transmits the audio signal to the radio receiver 13 of one speaker to which the utterance detection device 10 is attached. Subsequently, the wireless receiver 13 that has received the audio signal outputs the received audio signal to the signal generator 14. Subsequently, the signal generator 14 converts the electrical signal output from the wireless receiver 13 into a vibration signal for vibrating the vibrator 15, and outputs the vibration signal to the vibrator 15. As a result, the vibrator 15 vibrates and reaches the ear of one speaker through a person's face or bone, so that one speaker is away from the voice of the other speaker or the transmission of the voice. It is possible to listen in difficult places.

  According to the speech detection apparatuses 10 and 20 having the above-described configuration, the following effects can be achieved. That is, if any one of the utterance detection devices 10 and 20 is attached to the lower jaw part of the speaker, the movement displacement amount of the lower jaw part that is operated when the speaker speaks can be detected. If a voice corresponding to the detected motion displacement amount is prepared in advance and the detected motion displacement amount can be converted into the voice, for example, a person who is in a state where the speaker cannot speak. Even if the speaker is a person who is in an environment where it is difficult for voice to be transmitted in outer space or underwater, the intention of the speaker can be detected. Therefore, the utterance detection devices 10 and 20 can be used to detect the intention of the speaker.

  Moreover, according to the voice communication system having the above-described configuration, mutual voice communication can be performed. In particular, since vibrators (voice vibration converters) 15 and 25 for converting information received by the transmission / reception unit into voice vibrations are provided, the voice vibrations are placed on the ears of the body of each speaker. If it is installed within the range where the voice reaches, and the voice vibration can be transmitted directly to the ear, mutual voice communication is possible even in an environment where the voice of the speaker is difficult to be transmitted, such as in outer space and underwater.

  Hereinafter, the present invention will be specifically described with reference to examples. In this embodiment, an experiment using the utterance detection device of the present invention and the result thereof are shown.

  FIG. 2 is a schematic configuration diagram showing an experimental apparatus including the utterance detection apparatus 200 used in the present embodiment. The utterance detection device 200 is made of plastic and has a flexible long sheet-like attachment member 30 (material PMMA, length 90 mm, width 7 mm, thickness 200 μm) and approximately the center of one surface of the attachment member 30. The attached acceleration sensor 31 (manufactured by Freescale Semiconductor, model number MMA7360L) and a signal line 32 connected to the acceleration sensor 31 are provided. The acceleration sensor 31 is a triaxial acceleration sensor that can measure acceleration in the x-axis, y-axis, and z-axis directions. The signal line 32 is connected to a power source 40 and an oscilloscope 41 for measuring air vibration (acceleration) detected by an acceleration sensor.

  FIG. 3 is a schematic diagram showing a state in which the utterance detection device 200 shown in FIG. 2 is attached to the front center of the central incisor of the speaker's lower jaw. In FIG. 3, parts such as lips and cheeks are omitted. 3, reference numeral 50 denotes the lower jaw, reference numeral 51 denotes the upper jaw, reference numeral 52 denotes the central incisor, reference numeral 53 denotes the molar, and reference numeral 60 denotes the denture base stabilizing paste.

  In each experiment shown below, as shown in FIG. 3, the denture base stabilizing paste 60 (trade name “Cushion Collect” (manufactured by Shionogi & Co., Ltd.)) is thickened on the other surface of the mounting member 30. It applied in about 3 mm, and performed in the state which affixed the speech detection apparatus 200 on the front center of the lower incisor's central incisor.

(Experiment 1)
A test subject (speaker) utters five letters “aiueo” of a Japanese vowel in a stationary position, measures the output voltage waveform from the acceleration sensor 31 with an oscilloscope 32 (manufactured by Tektronix, DSA 70804), and the voltage Based on the waveform and the sensitivity of the acceleration sensor 31, the temporal change in acceleration in each of the x-axis, y-axis, and z-axis directions was obtained.

(Result of Experiment 1)
For each of the x-axis, y-axis, and z-axis, graphs showing the temporal change in acceleration at the front part of the central incisor 52 of the lower jaw during speech are shown in FIG. 4, FIG. 5, and FIG. Here, the utterance timings (“arrows” in FIG. 6) of “a, i, u, e, o” shown in FIG. 6 correspond also in FIGS. FIG. 7 is a graph obtained by enlarging and synthesizing a predetermined portion of FIGS. 4 to 6. 4 to 6, it can be seen that the acceleration before utterance (up to about 1 second) is about 0 G in the x-axis and y-axis directions, but about -1 G in the z-axis direction. This indicates that the x-axis and y-axis directions are substantially perpendicular to the gravity, and the z-axis direction is the opposite direction of gravity. As shown in FIG. 7, when the utterance starts, the acceleration repeatedly increases and decreases sharply in a short time, and on the horizontal axis scales of FIGS. 4 to 6, it appears as if the acceleration has a width. And the width of the acceleration changes for every character, and if it sees according to a direction, it changes notably in order of az axis, x axis, and y axis direction. Further, looking at the median value of these acceleration widths, it can be seen that although there is not much change in the y-axis direction, the increase / decrease is repeated for each character in the x-axis and z-axis directions. This change was more remarkable in the z-axis direction than in the x-axis direction.

  Furthermore, frequency analysis was performed to examine the acceleration at the time of speech in detail. The results are shown in FIGS. In addition, each graph of FIGS. 11-13 expands the one part frequency band of the graph of FIGS. 8-10, respectively.

  From FIG. 8 to FIG. 13, the power spectral density from 2 Hz to 10 Hz and from 200 Hz to 300 Hz is high in all the x-axis, y-axis, and z-axis directions, and there are two peaks on the low-frequency side and high-frequency side in this frequency range. I found out that Here, looking at the power spectrum density for each of the x-axis, y-axis, and z-axis directions, at low frequencies (2 Hz to 10 Hz), the power spectrum density in the z-axis direction is higher than the power spectrum density in the x-axis or y-axis direction. At high frequencies (200 Hz to 300 Hz), the power spectrum density in the x-axis direction and the z-axis direction were similar, and higher than the power spectrum density in the y-axis direction. The peak on the low frequency side where the power spectral density is high is about 3 Hz if the subject simply moves the jaw as much as the number of spoken characters (5 characters) in 1.5 seconds, which corresponds to the same frequency. To do. From this, it is understood that the jaw movement is detected for the low frequency component. This can also be seen from the fact that the power spectrum in the z-axis direction that most closely matches the jaw movement direction among the low frequency components is higher than the power spectrum in other directions. By the way, the reason why the power spectral density of 1 Hz, which is lower than the peak on the low frequency side, is high in the x-axis direction is not considered to be jaw movement for the above reasons. I guess it is exercise.

  On the other hand, the high frequency region where the power spectral density is high is almost identical to the first formant frequency of the vowels “o” and “e”. From this, it is considered that the speech of the high frequency component appears to be transmitted to the acceleration sensor 31 attached to the central incisor 52 of the lower jaw 50 by bone conduction, and the acceleration sensor 31 can detect the voice. I found out. In particular, since the power spectral density in the x-axis and z-axis directions is high, it is considered that the acceleration in the x-axis and z-axis directions of the central incisor 52 may be measured in order to detect sound. Incidentally, a slightly lower peak is also seen in the power spectral density near 500 Hz, and this peak is also almost coincident with the first formant frequencies of the vowels “I” and “U”. From the above, in order to detect the movement of the jaw, it is preferable to measure the acceleration in the vertical (z-axis) direction of the central incisor 52, and to detect the voice, the front and rear (x-axis) of the central incisor 52 or It turned out to be good to measure it in the vertical (z-axis) direction. That is, it has been found that if only the vertical acceleration of the central incisor 52 is measured, it is possible to efficiently detect both chin movement and voice by using only a uniaxial acceleration sensor.

(Experiment 2)
Next, in order to examine the movement of the chin of the speaker and the voice individually, when the mouth is moved without making a voice (hereinafter referred to as lip synchronization), the voice is made without moving the mouth ( The acceleration in the vertical (z-axis) direction of the intermediate incisor 52 in the case of “humming” was measured. Here, FIG. 14 shows a change in the acceleration of the front part of the middle incisor 52 of the lower jaw 50 by lip synchronization, and FIG. 15 shows a change of the acceleration of the front part of the middle incisor 52 of the lower jaw 50 by humming. The acceleration at the time of lip synchronization shown in FIG. 14 was measured by having the subject imitate the mouth of the Japanese vowel “aiueo” without making a voice. On the other hand, the humming acceleration shown in FIG. 15 was measured by having the subject close his mouth and uttering the Japanese vowel “aiueo” without moving his chin. At this time, my mouth was closed, so I could hear an unclear voice in the outside.

  Looking at the result of lip synchronizing shown in FIG. 14, unlike the result of normal speech in Experiment 1 above, the acceleration does not repeat increasing and decreasing in a short time, so it does not seem to have a width, It can be seen that the acceleration changes synchronously. Incidentally, the difference in size was about 0.5 G at the maximum. On the other hand, when FIG. 15 is seen, like the result of the experiment 1, when there is a utterance, the acceleration repeatedly increases and decreases in a short time, and has a width. This width is about 0.6 G at the time of normal speech, and is about 1.6 G at the time of humming, which is extremely increased. This is presumed to be caused by the fact that the mouth is closed and no sound leaks to the outside, and the sound reverberates in the mouth. Further, the median value of the width was almost constant, unlike the result of the normal utterance in Experiment 1.

  Next, FIG. 16 shows the power spectrum of the acceleration of the front of the central incisor 52 of the lower jaw 50 obtained by lip synchronization in this experiment, and the acceleration of the front of the central incisor 52 of the lower jaw 50 by Hamming is shown in FIG. The power spectrum is shown in FIG. At the time of lip synchronization, there is a peak on the low frequency (2 Hz to 10 Hz) side as in the result of Experiment 1 (FIGS. 8 to 13), but there is no peak on the high frequency (200 Hz to 300 Hz) side. However, the result was different from the result of Experiment 1 above. At the time of hamming, unlike the result of Experiment 1, there was no peak on the low frequency side, and there was a peak on the high frequency side, and the same result as in Experiment 1 was obtained. From these, it became clear that the peak on the low frequency side appeared due to the movement of the jaw, and the peak on the high frequency side appeared due to utterance. From this, it was found that the three states of speech, lip synchronization, and humming can be recognized by measuring the acceleration in the vertical (x-axis) direction of the central incisor 52 and performing frequency analysis.

  From Experiments 1 and 2 above, it can be seen that the air vibration excited by the voice of the speaker can be efficiently detected by the speech detection device according to the present invention.

  It can also be seen from Experiments 1 and 2 that the utterance detection device according to the present invention can efficiently detect mandibular movement information (motion displacement). If the lower jaw movement information is used, it is possible to accurately determine which character is being spoken in combination with air vibration information and lower jaw movement information even if the speaker's voice is small. Is also possible.

<Modification>
The present invention can be changed in design without departing from the scope of the claims, and is not limited to the above-described embodiments and examples. For example, the utterance detection device 200 shown in the above embodiment may be used by sticking it to a portion near the throat of the lower jaw using an adhesive tape or the like. When used in this way, it is possible to efficiently detect not only the mandibular movement information (movement displacement amount) but also the body vibration excited by the utterance of the speaker (the vibration of the vocal cords during utterance). . If the detected body vibration information is also used for voice conversion together with mandibular movement information (motion displacement amount), the intention of the speaker can be detected more accurately.

  Moreover, in the said Example, although it shall be able to attach to a tooth | gear, instead of this, the attachment member was made into a small thing, and what can be attached to the circumference | surroundings of a mouth part of a speaker, or an oral cavity, and by the voice of a speaker It is possible to efficiently detect the air vibration that is excited and transmitted to the periphery of the mouth or inside the mouth.

  In the speech detection devices 10 and 20 in the above embodiment, the vibrators 15 and 25 (sound vibration generation unit) are used, but instead of these, a speaker or an earphone or the like (sound generation unit) that simply utters a sound is used. It may be used.

  In the utterance detection device 10 of the above embodiment, the wireless transmitter 12 and the wireless receiver 13 are separately shown. Instead, the wireless transmitter 22 and the wireless transmitter in the utterance detection device 20 of the above embodiment are shown. A transceiver that can transmit and receive with the receiver 23 and has an integrated transmission and reception function may be used.

  The speech detection device of the above embodiment and examples may be embedded in the inside of a speaker's face (for example, the pharynx, larynx, airway, oral cavity, nasal cavity, or the vicinity thereof). . Further, the attachment member may be a denture, and the acceleration sensor may be embedded in the denture.

  In the above embodiment, the voice communication system 100 capable of communicating with each other has been described. For example, the acceleration sensor 11 and the wireless transmitter 12 of the utterance detection device 10, the wireless receiver 23 of the utterance detection device 20, the signal generator 24, Only a configuration with the vibrator 25 may be used as a transmission system in one direction. At this time, instead of the vibrator 25, a sound generator that generates sound or a light generator that generates light is used to detect that the speaker is operating the lower jaw, and the detection result is transmitted to another person. It is good also as a system which reports.

  In the above embodiment, the utterance detection device is attached so that the acceleration sensor is positioned near the central incisor of the lower jaw. However, the present invention is not limited to this, and the lower jaw may be attached at any position. Good.

10, 20, 200 Speech detection device 11, 21 Acceleration sensor 12, 22 Wireless transmitter 13, 23 Wireless receiver 14, 24 Signal generator 15, 25 Transducer 30 Mounting member 31, 73 Acceleration sensor 32 Signal line 40 Power supply 41 Oscilloscope 50 Lower jaw 51 Upper jaw 52 Middle incisor 53 Molar 60 Denture base stabilizing paste 71 Tubular member 72 Movable plate 100 Voice communication system

Claims (6)

An attachment member that can be attached to the lower jaw of the speaker;
An utterance detection device comprising: an acceleration sensor fixed to the mounting member and capable of detecting an amount of motion displacement of the lower jaw. The mounting member is a long plate-like member having flexibility;
The utterance detection device according to claim 1, wherein the acceleration sensor is attached to one surface of the long plate-like member. The attachment member is attached around the mouth or in the oral cavity,
The utterance detection apparatus according to claim 1, wherein the acceleration sensor detects air vibrations excited by generation of the speaker.   The utterance detection apparatus according to claim 1, wherein the acceleration sensor detects body vibration excited by the generation of the speaker. Having two or more utterance detection devices according to any one of claims 1 to 4,
Each of the utterance detection devices
A transmission / reception unit that mutually transmits and receives information detected by each acceleration sensor;
A voice communication system comprising: a voice generation unit that converts information received by the transmission / reception unit into voice and emits it. Having two or more utterance detection devices according to any one of claims 1 to 4,
Each of the utterance detection devices
A transmission / reception unit that mutually transmits and receives information detected by each acceleration sensor;
An audio communication system comprising: an audio vibration generation unit that converts information received by the transmission / reception unit into audio vibration and emits the information.

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